Atmosphere/libraries/libstratosphere/source/os/os_light_message_queue.cpp

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2021-09-29 19:55:52 +00:00
/*
* Copyright (c) Atmosphère-NX
2021-09-29 19:55:52 +00:00
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "impl/os_timeout_helper.hpp"
#include "impl/os_message_queue_helper.hpp"
namespace ams::os {
namespace {
using MessageQueueHelper = impl::MessageQueueHelper<LightMessageQueueType>;
template<bool ClearEvent, auto EnqueueFunction>
bool TryEnqueueLightMessageQueueImpl(LightMessageQueueType *mq, uintptr_t data) {
/* Perform the enqueue. */
{
/* Acquire exclusive access to the queue. */
std::scoped_lock lk(util::GetReference(mq->mutex_queue));
/* Check that we can enqueue. */
if (MessageQueueHelper::IsMessageQueueFull(mq)) {
/* If we should, clear the event. */
if constexpr (ClearEvent) {
util::GetReference(mq->ev_not_full).Clear();
}
/* We can't enqueue because we're full. */
return false;
}
/* Enqueue the data. */
EnqueueFunction(mq, data);
}
/* Signal that we're not empty. */
util::GetReference(mq->ev_not_empty).SignalWithManualClear();
return true;
}
template<bool ClearEvent>
bool TrySendLightMessageQueueImpl(LightMessageQueueType *mq, uintptr_t data) {
return TryEnqueueLightMessageQueueImpl<ClearEvent, MessageQueueHelper::EnqueueUnsafe>(mq, data);
}
template<bool ClearEvent>
bool TryJamLightMessageQueueImpl(LightMessageQueueType *mq, uintptr_t data) {
return TryEnqueueLightMessageQueueImpl<ClearEvent, MessageQueueHelper::JamUnsafe>(mq, data);
}
template<bool ClearEvent>
bool TryReceiveLightMessageQueueImpl(uintptr_t *out, LightMessageQueueType *mq) {
/* Perform the receive. */
{
/* Acquire exclusive access to the queue. */
std::scoped_lock lk(util::GetReference(mq->mutex_queue));
/* Check that we can receive. */
if (MessageQueueHelper::IsMessageQueueEmpty(mq)) {
/* If we should, clear the event. */
if constexpr (ClearEvent) {
util::GetReference(mq->ev_not_empty).Clear();
}
/* We can't enqueue because we're full. */
return false;
}
/* Receive the data. */
*out = MessageQueueHelper::DequeueUnsafe(mq);
}
/* Signal that we're not full. */
util::GetReference(mq->ev_not_full).SignalWithManualClear();
return true;
}
template<bool ClearEvent>
bool TryPeekLightMessageQueueImpl(uintptr_t *out, const LightMessageQueueType *mq) {
/* Perform the peek. */
{
/* Acquire exclusive access to the queue. */
std::scoped_lock lk(util::GetReference(mq->mutex_queue));
/* Check that we can peek. */
if (MessageQueueHelper::IsMessageQueueEmpty(mq)) {
/* If we should, clear the event. */
if constexpr (ClearEvent) {
util::GetReference(mq->ev_not_empty).Clear();
}
/* We can't enqueue because we're full. */
return false;
}
/* Peek the data. */
*out = MessageQueueHelper::PeekUnsafe(mq);
}
return true;
}
}
void InitializeLightMessageQueue(LightMessageQueueType *mq, uintptr_t *buffer, size_t count) {
/* Check pre-conditions. */
AMS_ASSERT(buffer != nullptr);
AMS_ASSERT(count >= 1);
/* Construct objects. */
util::ConstructAt(mq->mutex_queue);
util::ConstructAt(mq->ev_not_empty, false);
util::ConstructAt(mq->ev_not_full, true);
/* Set member variables. */
mq->buffer = buffer;
mq->capacity = static_cast<s32>(count);
mq->count = 0;
mq->offset = 0;
/* Mark initialized. */
mq->state = LightMessageQueueType::State_Initialized;
}
void FinalizeLightMessageQueue(LightMessageQueueType *mq) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Mark uninitialized. */
mq->state = LightMessageQueueType::State_NotInitialized;
/* Destroy objects. */
util::DestroyAt(mq->ev_not_empty);
util::DestroyAt(mq->ev_not_full);
util::DestroyAt(mq->mutex_queue);
}
/* Sending (FIFO functionality) */
void SendLightMessageQueue(LightMessageQueueType *mq, uintptr_t data) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Repeatedly try to send. */
while (!TrySendLightMessageQueueImpl<true>(mq, data)) {
/* Wait until we can try to send again. */
util::GetReference(mq->ev_not_full).WaitWithManualClear();
}
}
bool TrySendLightMessageQueue(LightMessageQueueType *mq, uintptr_t data) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Try to send. */
return TrySendLightMessageQueueImpl<false>(mq, data);
}
bool TimedSendLightMessageQueue(LightMessageQueueType *mq, uintptr_t data, TimeSpan timeout) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
/* Create timeout helper. */
impl::TimeoutHelper timeout_helper(timeout);
/* Repeatedly try to send. */
while (!TrySendLightMessageQueueImpl<true>(mq, data)) {
/* Check if we're timed out. */
if (timeout_helper.TimedOut()) {
return false;
}
/* Wait until we can try to send again. */
util::GetReference(mq->ev_not_full).TimedWaitWithManualClear(timeout_helper);
}
return true;
}
/* Jamming (LIFO functionality) */
void JamLightMessageQueue(LightMessageQueueType *mq, uintptr_t data) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Repeatedly try to jam. */
while (!TryJamLightMessageQueueImpl<true>(mq, data)) {
/* Wait until we can try to jam again. */
util::GetReference(mq->ev_not_full).WaitWithManualClear();
}
}
bool TryJamLightMessageQueue(LightMessageQueueType *mq, uintptr_t data) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Try to jam. */
return TryJamLightMessageQueueImpl<false>(mq, data);
}
bool TimedJamLightMessageQueue(LightMessageQueueType *mq, uintptr_t data, TimeSpan timeout) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
/* Create timeout helper. */
impl::TimeoutHelper timeout_helper(timeout);
/* Repeatedly try to jam. */
while (!TryJamLightMessageQueueImpl<true>(mq, data)) {
/* Check if we're timed out. */
if (timeout_helper.TimedOut()) {
return false;
}
/* Wait until we can try to jam again. */
util::GetReference(mq->ev_not_full).TimedWaitWithManualClear(timeout_helper);
}
return true;
}
/* Receive functionality */
void ReceiveLightMessageQueue(uintptr_t *out, LightMessageQueueType *mq) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Repeatedly try to receive. */
while (!TryReceiveLightMessageQueueImpl<true>(out, mq)) {
/* Wait until we can try to receive again. */
util::GetReference(mq->ev_not_empty).WaitWithManualClear();
}
}
bool TryReceiveLightMessageQueue(uintptr_t *out, LightMessageQueueType *mq) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Try to receive. */
return TryReceiveLightMessageQueueImpl<false>(out, mq);
}
bool TimedReceiveLightMessageQueue(uintptr_t *out, LightMessageQueueType *mq, TimeSpan timeout) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
/* Create timeout helper. */
impl::TimeoutHelper timeout_helper(timeout);
/* Repeatedly try to receive. */
while (!TryReceiveLightMessageQueueImpl<true>(out, mq)) {
/* Check if we're timed out. */
if (timeout_helper.TimedOut()) {
return false;
}
/* Wait until we can try to receive again. */
util::GetReference(mq->ev_not_empty).TimedWaitWithManualClear(timeout_helper);
}
return true;
}
/* Peek functionality */
void PeekLightMessageQueue(uintptr_t *out, const LightMessageQueueType *mq) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Repeatedly try to peek. */
while (!TryPeekLightMessageQueueImpl<true>(out, mq)) {
/* Wait until we can try to peek again. */
util::GetReference(mq->ev_not_empty).WaitWithManualClear();
}
}
bool TryPeekLightMessageQueue(uintptr_t *out, const LightMessageQueueType *mq) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
/* Try to peek. */
return TryPeekLightMessageQueueImpl<false>(out, mq);
}
bool TimedPeekLightMessageQueue(uintptr_t *out, const LightMessageQueueType *mq, TimeSpan timeout) {
/* Check pre-conditions. */
AMS_ASSERT(mq->state == LightMessageQueueType::State_Initialized);
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
/* Create timeout helper. */
impl::TimeoutHelper timeout_helper(timeout);
/* Repeatedly try to peek. */
while (!TryPeekLightMessageQueueImpl<true>(out, mq)) {
/* Check if we're timed out. */
if (timeout_helper.TimedOut()) {
return false;
}
/* Wait until we can try to peek again. */
util::GetReference(mq->ev_not_empty).TimedWaitWithManualClear(timeout_helper);
}
return true;
}
}